Bearing for pulverizer-mill rollers.



R. A. LACHMANN. BEARlNG FOR PuLvEmzER MILL RoLLERs.

APPLICAUON HLED DEC. 7, 1915.

R. A. LACHMANN. BEMHNG FOB PULVERIZER NHLL ROLLERS. APPLscMmN meu um. '1. e915.

1 1 98,856. lamltw Sept. 1S), 1916.

2 SHEETSWSHEET 2.

4 /NVENTO/e.

A yTTU/UVE V4 y UNITED STATES PATENT oFFIon.

ROBERT A. LACHMANN, GF CHICAGO, IPLINOIS, SEEIGNR TO RAYMOND# BRTHER IMPACT PULVERIZER COMPANY, .0F CHICA, ILLNGIS, .A CORPORATIQQ" GF ILLINOIS. .v

B'ENG FOR PLVERIZE-QLT RGLLRS.

.198,8555, Specicetion of Letter' @riginal application 'c Hay 10, 1915, Serial No. 27)..4. 3 1815. Serial No. 85,72%

improvements in the structure which sup-I porte Aand zill'erels a. hearing for e` roller in a` mill or' this type, which 'improvements re iai@ particularly to the lubrication of the hearing surfaces' und the exclusion therefrom of duel'. grit, and the like. In a. mill of this SoriJ ihr rollers are Suspended in the pulverizing; chamber so as to he exposed to the nely divided materiel in the Yiiorrn of ilus-b. grii; el wier 'which min only be kept l out of ihe l) ings of the Tellern hy {rrovidf u runsta'nt flow oi luluriceui along fill ofthe lie-ringe surl'neeei lt is desirable, for

reiieons of economy anni for ether obvious re Sons. that there ehould he nu Waele of the lubricant. Just enough Should he supplied lo the hearing surfaces tolli e@ them prop early lulrirreiei :and in meintl n proper lubrication. :um lawn oni' foreign similiar. My invention prox uien a renetrucion for eceoin plishingr this result. A further olijre' i@ to proyilie u luhrieniing:r ,gj/stein for n roller hearing of the type described uliiitn will permit the use of a relatively thin, light o insstend of ghe usual grease. (lil is more desirable in this connec tion because of ite greater lubricating value and its free-(loin from ille foreign matters or fillers which form un ingredieu of greuses which are, to u certain extent.; injurious to the bearing Surfaces.

A further object is to provide a bearing structure for the roller of a pulverizing mill which will accommodate itSel'i to a Slight bending or straining of the shaft on which the roller turns'likely to occur-oneccount of the thrust of the roller against the bull ring. A

he invention has for further ohjeets such other new and improved constructions, ar-

Patented Sepia. 143i. 'i

' au unil mis application filed Elec w, .if lumber fit-'S is a leien el' mi' end my ,nenn :a p embefli'nent, in the accompanying alim Figure l, is a longitudinal emilion.. vermin parte in elevation, of ar roller hearing; Structure on which the :annu mounted, a portion of the bull ring frein-i el. which the roller bears being shown. h 2 is n sectional plan on line 2-2 of Fn Fig. 3 is a longitudinal Section on line of Fig. l. Fig. 4 is a. Sectional {Je-rapaci. of the upper member of the bearing el( f which is interposed between the liousin the roller. Fig. 5 is a similar View :fr lne lower member of the housing. Fig'. lf3 Similar view of the lower member nl beringr element. Fig. 7 is a plan v' one of the ihruet ringej arranged he, 'dri-- roller nini the head of ihe Shall the rol mounted. and Figa 5S sectional viewe on lines 8-8 and speetivelyx of Fig. 7.

Like ehuructere of reference designa," parte in the Several .figiares of the firewire" Referring lio the :l i ings. the l 26 'the hull ril :i winning im: "i u @lmnp ln menne olf Whirl sourire-.l 4 illy 11o a, making Shah alter is supported Within the pulreririn-f Chamber o the mill in the uuual insinuar.

Si) iss a eluififursned :it the lower ein! willi u` head 31 on which Mroller irs euppo's The bruising fernuni with a, longitufiimil slot 3i and the sloi'ted side with ne treneversn perfor aliene for the olainpin bolts 2lifor securing the :shaft in the` housing. Pref erebly the bolts 33 engage grooves 34 out in 95 the Shaft 3() Fig. 2). The housing is formed at the bottom with flange 35 to which is attached by bolt-s B6 en ennulan meiber 37 having e depending flange S8. Interposed between the housing und. the hub 7mo 39 of roller 25 is an annuler lljlpring element consisting preferably of 'a ring l0, the vonder Surface 41 of which is concave, ami a ring' 42, the upper surface of which is correspond ingly convex. The ring 40 lies Within the ange 38 of the lower casing member 37 anal -as bearing is formed with interior ribs l between which are interposed gaskets or paclfing rings 44 which bear against the shaft il The bearing surface of flange 38 is preferably provi ed with packing rings The ring 40 is formed with a lubricant channel 46 which is supplied with lubricant from a duct 47 in the housing, the latter communicating with the channel -16 through an opening 4e' in the housing member 37. The annular bearing element 40, 4i?, pressed against the hub of the roller by suitable elastic means. for example, by coiled springs 49 arranged in recesses 50 in the housing and extending through registering openings .31 in the annular member 37. The ring 40 is preferably held from rotation by guide pins 52 which extend through openings 53 in the annular member 37 and into recesses 54 in the housing 27, the pins having threaded eX- treinities 55 engaging webs 56 on the ring 40 (Fig. 4). The lower ring 42 is preferably, though perhaps not necessarily, engaged with the upper ring 40 in such manner as to hold the lower ring from rotation while permitting a certain lateral shift between the rings in case the shaft 3i) bends onder the thrust of the roller against the bull ring. To this end the lower ring is providcfl v ith studs 57 which enter slots 58 in the upper ring. The lower ring has been described upon the huh IS.) of tl roller. It is obvious that, if desired, thrust Hugs might be intcrposed between these pacha. f `hc roller 25 is preferably provided with a bushing 59 having a flange i3() fitting into a ref-css (51 on the under sidc ol' thc roller. lnterposed between the flange of thc bushing and the head 3l of shaft 3 0 arc a plurality of thrust rings,preferably thrcc in number. The lower ring (32 is secured by studs (i3 to the hcad. 'lhc upper ring il is secured by similar studs (i5 to the body of the roller. the passingf through the flange 6() of the hing so as to hold the latter in position on thc rolls". 'the intermediate ring (36 has a fiiuitiiig rolf 'n with respect to thc other rings and pn @ably one or more of the rings are formed .ai their bearing surfaces with eccentric grooves |17 which touch the inner .ind outer circuni.ici-cuccia of the rings pro.iding positive means for forcing the lubricant between saifi rings to tbe bearing saciar-es ot thc bushing and shaft. 'liie shaft 30 is hollow so as to provide a lubricant duct (38 which extends lengthwise the.cthrough. The head of the shaft is formed )refcrably with radial branch ducts (i9. "he end of the shaft and thrust rings are in closed by a cap which is secured to the roller, preferably with the intel-position of a gasket 71 by bolt 72. The cap provides a closed iubrii ating space 73 around the thrust rirf's.

'i he upper end of the housing is closed .by

the bull ring a bonnet 74 held in place b a cutter pin 75 and provided with a threa ed nifpple 76 for a cap 77. The u Y per end of sha'. t 30 is pio vided with a pug 78 having an opening therein into which fits u'valvey 79 secured to the cap 77.

Operation: The housing, it will be under stood. is suspended by means of the trunnion shaft 2H so that the roller 25 bears against 26. The roller and its supporting structure is given a movement of roaticz. within the mill which causes the roller te haar against and move around thel interior of the ,hull ring revolving on shaft 3U as an axis. When oil is used as a lubricant, which is desirable, for the reasons above stated and is feasible because of the peculiar construction of the device of my invention, the lu hricatinrr hn-.ts 47. 68 may be filled by removing cap 77. If a heavy grease vis employed it will ordinarily be necessary to remove the bonnet 74. and plug 7S. The lubricant duct 47 supplies lubricant to the bearing surfaces between the flange 348 of thc lower housing member 37 and the upper member 4() of the annular bearing element which is interposed between the housing and ilal roller. The bearing element is held from rotation by guide pins 52 but in such a way zo to pczrnit vertical movement to talle up wear. 'lhc bearing clement is kopt closely pressed against the hub of the rollei by springs 49. ly making the bearing element in two parts. 4U, 42, with co-engaging con cave and convex surfaces, a certain amount of lateral displacement is possible to accom niodate for a slightibending of the sha ft 30 dac to thrust of the roller against the bull ring. The lubricant in duct 68 in shaft SO is forced by its`liead and by capillir'v attrae 105 tion into thil lubricant chamber 7.3 .ind Sie twccn the thrust rings ($2, (i4, (it.) to the baaring surfaces between the shaft Il() and the bushing 5ft, and thence it passes up along4 these bcariiigtsurfaccs to the space 8O above 1m? the bushing 5f). enough of it passing out bel tween the rin s 4i). 42 and between the latter vention. rtherefore do not wish t0 be undex-stood as intending to limit the invention to the particular constructions, ments and -devices shown and ccpt so far as the claims limited.

By the terms substantially upright as describing the position` of the housing, I do not wish to exclude a position which is a 180 Y arrangedescribed exare specifically so "lille: housing :unl milf 0i" :i Si'mifit si, hun@ ing; adtifr'fi-u'i `ibo summit" Lim shaft im Suiyliiiiiv tially eignigii, punition, n when* rewlmsijil siippmiml un the lower and ovtm sliiiff :iwi au annular' 'lr-@airing element interview-"l my tween ilu? housing and the relier; 511ml Simili being flemici witii ii lubricant, duit tu suppl; lubriitfint lo the bearing surfaces nl' the: roller nml shaft, and the housing with n duwt to supply liiln'icant to said bearing eiixieiiz. 21. lli apiffxmus of the azliffimfzei: fic- Scribeal, slw .limition nf u Shaft a limi@- ing adiipifd lo support, time .shaft in Sul-Simiv tiaally nprigii position, miler mvoli'slily sappi .i im ilse lower (er-.d of lille wil; zu ammlm if, 9.' Qlenii inte-rpm fili@ bui? i, ing ailay'e 'iixlly upa'igl'i. position siipiiried am this lia-mfr and L t, annular Qiemenl imm? ille Refusing :mii tile rollf.l elast ,i'ai,ing to llimsb said bearing: .against the 'rollerVH and guido pin@ @w iiaial lieux-mg: element and housing; :an lfeirig foiih'l with a` liiiviiicant il ply lubricant to tile bearing Sim: roller and shaft, and the housiiig m i tu supply lubricant to said bearing wleiiiciii@ 4. vIn apparatus of the alum sm'ibed, the combination of n shaft, a housing adapted to supp-vrt the shaft in Substantially upright positipm roller ,rewluhly Supported, im the limer and 1f; il manillar bearing @lemmi v V by ail limisng and iiiieipi i listview. ilw l using iwithe roller; mid. @dit being fm'mmi will; zi lubricant dui-,ii i., multiply lvl nificant to lle bearing surfaces of iii voller und Shaft, and tlm housing with .a duw; t@ supply lubricant in said bearing element.

5. In appainli of the character de" -mibed, the combination of a shaft..y a housngzaaiapted tu support the shaft in subsim tially upright posiiom a roller remliibly supported on' the lime? @mi of the simil, :in annular bearing.' g-liiiufi i ina'teriosed lwiiwen am". 'Wmed Vith ai lubricating imma mi upper sux'i'aw: said :shaft being! fom i* ".viil; u lulai'icun duct to supply iiibiifzmm a@ 'the bearing Sur-- um im g'z'ievaiiiiug f in lietwim sziii'i ge; wliiiv um mg aeiggsilur cliswiemef i? im@ "x itil *am/pesi, u; tim mimi'.

i: app* mais. o3", Lili: clim-mien* lie ilieil., this igennllinuioii of :i :slm iti u ilonairig duitac if su? 'tm-; the shaft in substffiw ifi-Lily upright pwsiiioii, :1 roller i'ewluiilfy Smmmlfl i Y lower @nel in Elu? Shaft, mi a-.iirilzii' l ig @ummm l iivipmied lwweeen 'flic limi mg funi .ilw :Julien and means pri;- viiling n lulu-iw at simi-'e aramid ille lower @mi uf all? Slirzi; said Quail being farmed wtl'i a lubric'nut mi tn supply lubricant to iii@ bearing surfaces of the miler uml sl'mf :mil tlm. housing with a duct to supply lulu. ecum. to said beau-ingr elementi.

il). la apparatus of 'the character deswibedi alle combiuuiiem of :i` slinlh a housing :ulnpiwi lo sugipm'i the shaft in subsi-11'1- liaily u'gnigglit, misitium roller res'olulily mpgmi'lcf, mi lle, lower emi mi the shaft, an :mimlzi luwi mg! elciiimi. interposed webwml *Lilie linigsvff @mi rulli-,11g heini mi the lriwirl a lubricant chamber :around said thrustl rings; aid shaft heinn foi-med with a 1uhrimnt duet extending therethrough anel oommunieziintf with mid lubricant chamber: and the homing with :i lulirieziut duct'iio muuuy' r lulni ilv to mail hearing element.

y ol the chaifirert'tleal if sli'lti l: l'lb:

#haft in substan- :i :foller revoluhly sugmofted ma tlm ffm-r eetl ol" the shaft.. an annular hearing element interieeed between the' .housing mui roller. a heed on the lower endof the haft thrust. rings interpoeed between. the holler :unl head.I i cap providing' :i lubricrimihguuher around said thrust -rings. a p21-filing.' ring intervening' between said hem-iin; element. unil shaft; said shaft being formed wih a lubricant duet extend me: therethrough und annimunuzating with saliti .lubricantk ehezuber mui the housing with :t lubricant duct to .supply a lubricant to Suid tearing element.

1:3. In, apparatus of the rhiiraeter deserihed, theI eoinbinzirion of a s mit, a hou ine: adapted to Support the shui't in substanvtially' upright. positiuu, u roller revoluhly Supported on the lower end ot' the shaft, un annuler beaming 'element irxterp-fvd between the licusini and roller` heiil on the lower end of the el uit, thru.; rings: interpofieil between the roller :xml head. :i @up providing a luhrimnt elnunber :ireuiul mici thrust Y rings. Springs which thrust @niet hearing ele menty against the roller. und means for pre-- renting; mtntion hetw :n :51ml hearing! element und the homing: .wel @mit being formed with a lubricant ilus; extending.

therethrough mail eummuniouli with said luhrieunt chamber und the h u Ju.; with u lubrieunt duet to supplj.' u luln'iu'zmt to said bearing element.

35i, n appui-aiu@ ol' tho znzarae'mr Cleseribeil, the .fonihirmtion o? n multa, ai hous ing adapted to summit ther .lnft in sub- Stankiiaiily upright pleinen. :i miler revolubly supported on th.A lo or end of the shaft, an annular bearing: elennui, interposed between the housing mul roller, a head onl the lowerfend uf the, .shulflu thrust rings interposed between the roller and head, :i Cup providing a luhrieant chamber around said thrust rings, springs whith thrulst Said hearing element nguiimt the roller, :1nd means for preventing rotuti i between said hearing element und the hou Alg; mid shaft being' formed with :i luhrieuut duct extending therethrzmfh final vom :mi ating with Suid lubricant el'uuuher :mil Q.. using lwith n luhrieant (hiet to .supply u luhfint to said bearing element.

`ll. ln apparatus i the diameter (lez-arriheil. the comhinuiion of :i shaft, :i housiiner ".elwtell to support, the shaft in substantizly upright position, u roller revolunieuwe bly suppfvftiefl on the lower enfl el the, Shaft, im annular hearing element interpose hetween the huusmg und roller wniprhuud roller, und means for prevenn :'-aitatiun between Said hearing element sind the. iif u5- ing; said Shaft heing formed with a luhri-l mint Lluet extending therethrough uil fom-l muuimiting with Huid luhru'nnt elmmoer :intl 30 the housing with a lubrimint (hiet to supply :z nhrueini; to Suid hearing element,

L?. .in :ippuriitus nl' the eluizu-.fiw scribed. the Comhinution of :i fluit. ing :ulnpted to support the slush in'-whstmtiully upright position, ,fr f ievolu hl): nupiorted. on the low-ur um?. uf `f shaft., und :in annular hearing dement mijn poseo between the housing '1in-'l h-f miler said :drift ,being formed with :i lubricant'. liu-t to supply luhrieunt to the lwfwing surizires of the roller und shaft :Mul lue huuf5- ing with .i duet to sulfply luhiivzizi to s; id hearing;v element, will housing heir' 'wzneil with u depending thingie which iw the outer Surface of Suhl lieuiuigj 16. n :apparatus ol' the fha mfg; unibe-il, the Combination of :i .-lm with. :i lubricant flul't extending through, a .lumging adapted to :wily shaft in upright 'pugi'ion :mil provi. u lubricant .:hainher in the top :,iiSm uhiazh the :.Mier und of the .Qi/mit exten? ,f und with :i luinicunt duet. extending: flown' wzirdly through said. housing. :i rffxr rev-A olublr sumverteil Cm the lower #m5 of he shaft, an annular bearing ehimeul ini; rpoee between the housing und the mlier und adapted to be supplied Vwith 'iulrierini hy the duct in said houiaiug, and nieuw izvzm'irlilng a lul) ant ehamher at. the lows-r eiul if QuidV shaft with which the luliriimu duet in "iid shaft emunuinieatns. il?. In ni-params of the rhum-.rter scribed. the combination of fi shuft formed with u lubricant duet extending; therethrough.4 u houing adapted to support said shaft in upright [msition :xml prewided with :i lubricant chamber in the top through which the. upper Cnil of the shaft @lends mul. with a lubricant duet eitmirliog alown-- il@ athensiwf, with ,wiirilly through Suid housimr i roller rev- ,shaft communicates, and av closure .for the 13e upper end of housing 'adapted to close the lubricant duct in said shaft.v un I 18. In.' apparatus of the character vdescribed, the combination of a shaft formed with "a lubricant duct extending therethrough, la housing adapted to support said .shaft in upright position and provided with a lubricant chamber in the top'through Awhichtiie upper end of theshaft extendsA and with a lubricant' duct extending downwardly through said housing, a roller revolubly supported ,on the lower end of the shaft, anan'nular bearing'elemcnt interposed between the housing and the roller and adapted to be supplied with lubricant. by

the duct in said housing, means providinging adapted to support the. shaft in substansupported on the lower end of the shaft,'anA annular bearing element interposed-between tially upright position, va roller revolubly the housing and the roller comprising a pair of rings arranged one above the other and having lconcave and convex engaging surfaces, and. springs in said housing which thrust said bearing element against said roller; said-shaft bein formed with a lubricant duct to supply .1u i'icant to the bearing surfaces of the roller and shaft and the housing with a' duct to supply lubricant to.

said bearing element.

20. In apparatus of the Acharacter described, the combination of a shaft, a housing adapted to support the shaft in Vsubstantially upright position, a-roller revolubly supporte-d on the lower end of the shaft, an annular bearing element interposed between and bearing upon the vhousing and roller; said structure provided with lubricant ducts to sup ly lubricant to the bearing surfaces of tile shaft and roller bearing element and housing.

21. Iii apparatus of the .character described, the combination of a shaft, a housing adapted to support the shaft in substantially upright position, a roller revolubly supporte on the lower end of the shaft, `an annular b aring element interposed between and bearing upon the housing and roller, and elastic means which thrusts said bearing element against said roller; said struc-- ture provided with lubricant ducts to suppliy lubricant to the bearing surfaces of the shaft and roller bearing element and hous ing. Y

22. ln apparatus Aof the character described, the combination of a shaft, a housing adapted to support the shaft in substantially upright position, a roller re'volubly Asaid sha lubricating ducts adapted to supp1y lubri 1 ,right position and formed with supported on the lower -end of the shaft, an annular bearing element interposed between and bearingnpon the housing and roller movable longitudinally of but non-rotatable with respect to the housing, and elastic 70 means which 'thrusts said bearing element against said roller', said structure provided with lubricant ducts to supply lubricant tov the bearing surfaces of the shaft andfroller bearing element andhousing.

23. In 'apparatus .of the character described, the combination of a shaft. a lions, 'ing adapted to support the shaft in substantially upright position, a' roller i'evolubly supported on the lower end of the shaft, an -30 annular bearing element partially inclosed by said Yhousing and interposed between and bearing upon ,the housing and the roller; said structure being formed with lubricant ducts for supplying lubricant to the bearing a5 surfaces o f said shaft, roller bearing element `and housing. "24. In apparatus of. the character de` scribed, the combination of a shaft, a boilsing adapted to Support theshaft in substantially upright position, a roller revolubly supported on the lower end of the shaft, an annular bearing element interposed between and bearing upon the housing and roller and formed with a lubricating groove on its upper surface; said structure being formed with lubricatingvducts' adapted to supply lubricant to the bearingA surfaces of the shaft, roller,- bearing element and housing.

,'25, In apparatus of the character de- 1( scribed, the combination of ashaft, a housing adapted to support the shaft in substantially upright position, a roller revolu bly supported on the lower end of the shaft,

an annular bearing elementinterposed be- 1 tween and bearing upon the housing and the roller and provided on its inner surface. with a acking ring which bears a ainst ft; said structure being forme with cant to the bearingsurfaces of the shaft, roller, bearing element and housing.

26. In apparatus ,of the character described,'the combination of a shaft, a housing adapted to support the shaft in substan- J tially upright position, a roller revolubly supported on the lower end of the shaft, an annular bearing element interposed between and bearing upon the housing ,and the roller, and means providing av lubricant s'paee around the lower end ofthe Shaft; said structure being formed with lubricant ducts 'Y to supply lubricant to said bearing element and to said lubricant space.

27, In apparatus of the character describedfthe combination of a housing pro .vided with a depending flange, a shaft supported in said housing in substantially upa head on itslower end, a roller revolubly mounted on surrounding the head and thrust rings proriding a lubricant chamber; said Shaft being formed with. a` lubricant duct extending therethrough and the housing with a lubricant duct to supply lubricant to the bearing surfaces of said upper ring and the flange of the housing surrounding the. saine.

In apparatus of the character de- `scribed, the combination of a shaft, a housing .adapted to support the shaft in substantially upright position, a roller rcvolubly supported on the lower end of the shaft, and a hearing element interposed between the housing and the roller; said shaft being formed with a lubricant duct to supply the bearing surfaces of the i'ollcr and shaft, and the housing with a duct to supply lubricant to said bearing element.

' Q9. In apparatus of the character described, the combination of a shaft, ii housing adapted to support the shaft in substantially upright position, a roller 'revolublv supported on the lower end of the. shaft, an annular bearing clei'nent interposed'between said housing and roller.. adapted to assume an angular position with` respect to said housing, and elastic means which thrusts .said bearing element against said roller; said structure beingr provided with liibricant ducts to supply lubricant (o the bearingr surfaces of the shaft and roller bearing elcmcnt and housing.

ill). In apparatus of the character descr'ibed,thc combination of a shaft, a housing adapted to suppoit the shaft. a roller on said shaft, a bearing element interposed between the housing and roller; said strncture beingvprovided with lubricant ducts to supply lubricant to the shaft and bearing element. I

i 31. In apparatus of the characteiz de.- scribed, the combination el' a shaft. a housing adapted to support ib'- shaft, a roller on said shaft, a bearing .cuni-ut interposed be tween and bearing-upon the housing and roller, said struciu, being provided with lubricant ducts to supply lubricant to the shaft and healing element. A

' In apparatus of the character described` the combination with a shaft, a housing adapted to support the shaft in sub-` stautialh upright position, a roller on said Shafi :i be, ring element interposed between the hmmag and roller` said structure being roiiih-i; c uh lubricant ducts to supply luliricant to the shaft and bearing element. I

33. In apparatus of thecharacter described, the combination with a hou f provided with a lubricant chamber, a shaft supported in the housing, a roller on the ower encl of the shaft, a Vbearing' element interposed between and bearing upon the housing and roller and formed witha channel communicating with the lubricant chamber, and means for providing a lubricant space at' the lower endof thegshaft adapted to supply 'lubricant to the bearing surfaces of: Asaid roller.`

In apparatus of the characteridescribed, the combinationwith a housing provided with a lubricant chamber, a shaft supported in the housing, a roller on the lower end` ofthe shaft. a bearing element interpostd between and bearing upon the. housing and roller and formed with a channel communicating with the lubricant chamber, means for providing a lubricant space at the lower end of the shaft adapted to supply lubricant to the bearing surfaces of raid roller. and means carried by the bearing Amember to preventl the passage of lubricant from said lubricant space beyond said bearing member.

3G. In apparatus of the character described, the combination with a housing provided with a lubricant chamber, a shaft. supported in said housing, a roller on thc, lower end of said shait. a hearing member intorposed bctween and bearing upon the housing and roller, said apparatus being rorided with lubricant ducts to'supply lul icant to the hearing surfaces of said roller and bearing member, and means for providing a c10- sure for the inlet ends of said ducts. i

37. In apparatus of the character d escribed, the combination of a shaft, a housingrr adapted to support the Shaft in substantially upright position, a roller revolubly supported on the lower end of the shaft, a bearing element interposed between and bearing upon the housing and said roller, said housing being formed with a lubricant chamber and duct for supplying lubricant to said bearing element, and a shaft with a duct to su'pply lubricant to thex roller and shaft, und means for providing a closure for said ducts. comprising a plug screwed into the upper end of Said chamber, and means said housing being formed With a lubricant projwting througli said plug to close the chamber and duct for supplying lubricant duct in said shaft. to said bearing element, said Shaft being 38. In apparatus of the character deprovided with a duet to supply lubricant to 5 scribed, they crmlbination of a .fhaft, a housthe roller and shaft, a plug sccurvil fn the 15 ing adaptml to support the shan in substanduct in said shaft; and provided with an tally upright position, a roller rovoluhly aperture and removable means carried by supported on the lower end ol the shaft, a said first-named plug, adapted to extend hearing element interposed between and into said aperture.

10 `hearing upon the housing and said roller, ROBERT A. LAC'HMANN. 

